Multilayer films having reduced curling
AssigneeEquistar Chemicals, LP
InventorJeffrey C. Haley
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Abstract
Disclosed is a multilayer film. The multilayer film has the general structure of A/B/A/C or B/A/B/C, wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer. Adding a nucleating agent to HDPE improves the water vapor barrier property of the HDPE layer and the multilayer film, but it also causes the multilayer film to curl in the conventional multilayer film structures. The invention provides a multilayer film, which includes at least one layer of nucleated HDPE, with reduced or eliminated curling while retaining high water vapor barrier.
Claims15
A multilayer film having a general structure of A/B/A/C or B/A/B/C, wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer
- wherein the nucleated HDPE comprises an HDPE and a nucleating agent selected from the group consisting of glycerol alkoxide salts, hexahydrophthalic acid salts, and mixtures thereof
- wherein when the multilayer film has the structure A/B/A/C, A is present in a total amount equal to about 35 wt. %, based upon the total weight of the multilayer film, and wherein when the multilayer film has the structure B/A/B/C, B is present in a total amount equal to about 35 wt. %, based upon the total weight of the multilayer film.
A method for reducing or eliminating the curling of a multilayer film having a general structure of A/B/C or B/A/C, said method comprising adding a layer to the multilayer film to form a new film structure of A/B/A/C or B/A/B/C;
- wherein A is a nucleated high density polyethylene (HDPE) layer, B is a single or multilayer structure, and C is a seal layer
- wherein the nucleated HDPE comprises an HDPE and a nucleating agent selected from the group consisting of glycerol alkoxide salts, hexahydrophthalic acid salts, and mixtures thereof
- wherein when the multilayer film has the structure A/B/A/C, A is present in a total amount equal to about 35 wt. %, based upon the total weight of the multilayer film, and
- wherein when the multilayer film has the structure B/A/B/C, B is present in a total amount equal to about 35 wt. %, based upon the total weight of the multilayer film.
Dependencies are inferred from the claim text.